[Req] Show progress of step [4/5] when upgrading database to v2

[perfectazn]

In step 4 when "converting coin_store", it now can take several hours with no indication of how close of it being completed.

Perhaps print a % completion using "row / cursor" parameters of the "for" loop.
I'm not too familiar with python but its on line 357 of db_upgrade_func.py of the latest commit on Mar 28,2022.